Probably for emphasis. Who's the author? What's the title?
The author repeats the phrase "never-ending" to emphasize the feeling of continuousness or lack of conclusion. By using repetition, the author leaves an impression on the reader that life and the daily routine mentioned in the passage are monotonous and seem to stretch on indefinitely. This choice of repetition helps convey a sense of the speaker's exhaustion or frustration with the constant cycle of rushing through life and enduring endless lessons.
